布局很简单,代码就是打个日志看看,为了不影响阅读,放在最后
Android事件处理机制真是个磨人的小妖精,被她卡过两次,一卡住就不行玩安卓,跑过去玩html、js、css了
最好自己动手测试一下,印象更深

一、妖鸟三姐妹:dispatchTouchEvent---onInterceptTouchEvent---onTouchEvent

点击:ViewGroup1(最外层)

I/System.out: MainActivity dispatchTouchEvent
I/System.out: ViewGroup1 dispatchTouchEvent
              ViewGroup1 onInterceptTouchEvent
I/System.out: ViewGroup1 onTouchEvent
              MainActivity onTouchEvent
I/System.out: MainActivity dispatchTouchEvent
              MainActivity onTouchEvent
9414344-79bccd26acde4389.png
点击ViewGroup 1.png

点击:ViewGroup2(中间层)

I/System.out: MainActivity dispatchTouchEvent
              ViewGroup1 dispatchTouchEvent
              ViewGroup1 onInterceptTouchEvent
              ViewGroup2 dispatchTouchEvent
              ViewGroup2 onInterceptTouchEvent
              ViewGroup2 onTouchEvent
              ViewGroup1 onTouchEvent
              MainActivity onTouchEvent
I/System.out: MainActivity dispatchTouchEvent
              MainActivity onTouchEvent
9414344-f563dfab18922d5e.png
点击ViewGroup 2.png

点击:View1

I/System.out: MainActivity dispatchTouchEvent
I/System.out: ViewGroup1 dispatchTouchEvent
              ViewGroup1 onInterceptTouchEvent
              ViewGroup2 dispatchTouchEvent
              ViewGroup2 onInterceptTouchEvent
              View1 dispatchTouchEvent
              View1 onTouchEvent
              ViewGroup2 onTouchEvent
              ViewGroup1 onTouchEvent
              MainActivity onTouchEvent
I/System.out: MainActivity dispatchTouchEvent
              MainActivity onTouchEvent
9414344-4c13157a57b38075.png
点击View.png

苹果树上掉下(分发:dispatchTouchEvent false)个苹果(event),爷爷(ViewGroup1)拿到。
爷爷如果不分发(dispatchTouchEvent true)了,相当于把苹果扔了,谁都不吃,包括他自己
他如果截断(onInterceptTouchEvent true),自己可以把苹果吃了(执行onTouchEvent 并返回true),也可以不吃(flase),但只要截断,就不会再向下传了。

9414344-9ccf425c1da2bc2b.png
点击ViewGroup.png
dispatchTouchEvent:决定了事件是否继续分发下去和是否响应事件
false:继续分发,
true:不继续分发--此次事件到此结束,也不会有任何控件执行onTouchEvent方法。

onInterceptTouchEvent:决定了是否拦截该事件
false:不拦截
true:拦截---此时当前控件执行onTouchEvent方法。

onTouchEvent:决定了是否消费该事件
false:不消费
true:消费。

二、事件处理机制对view.setOnClickListener的影响

对于View1来说:setOnClickListener:
能执行必须前面的分发,不截断,畅通无阻, 并且自己的onTouchEvent返回super.onTouchEvent(event),有一个环节出现意外都无法触发

对于ViewGroup2(也就是View1的父容器),所有均默认,如果View1的onTouchEvent返回false
则点击View1的时候ViewGroup2的setOnClickListener会触发。

所以来看setOnClickListener的触发条件还是蛮苛刻的。


三、View的几个生命函数的调用顺序

用一个ViewGroup3,包裹View2和View3两个View,进行测试,详情看图

9414344-4208fd75497e3e93.png
ViewGroup.png

四、代码:

1.事件测试部分

View1

public class View1 extends View {
    public View1(Context context) {
        super(context);
    }

    public View1(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
    }

    public View1(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    @Override
    public boolean dispatchTouchEvent(MotionEvent event) {
        System.out.println(getClass().getSimpleName() + " dispatchTouchEvent:" );
        return super.dispatchTouchEvent(event);
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        System.out.println(getClass().getSimpleName() + " onTouchEvent:" );
        return super.onTouchEvent(event);
    }
}

ViewGroup1

public class ViewGroup1 extends LinearLayout {
    public ViewGroup1(Context context) {
        super(context);
    }

    public ViewGroup1(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
    }

    public ViewGroup1(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    @Override
    public boolean dispatchTouchEvent(MotionEvent ev) {
        System.out.println(getClass().getSimpleName() + " dispatchTouchEvent:" );
        return super.dispatchTouchEvent(ev);
    }

    @Override
    public boolean onInterceptTouchEvent(MotionEvent ev) {
        System.out.println(getClass().getSimpleName() + " onInterceptTouchEvent:");
        return super.onInterceptTouchEvent(ev);
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        System.out.println(getClass().getSimpleName() + " onTouchEvent:" );
        return super.onTouchEvent(event);
    }
}

ViewGroup2

public class ViewGroup2 extends LinearLayout {
    public ViewGroup2(Context context) {
        super(context);
    }

    public ViewGroup2(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
    }

    public ViewGroup2(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    @Override
    public boolean dispatchTouchEvent(MotionEvent ev) {
        System.out.println(getClass().getSimpleName() + " dispatchTouchEvent:" );
        return super.dispatchTouchEvent(ev);
    }

    @Override
    public boolean onInterceptTouchEvent(MotionEvent ev) {
        System.out.println(getClass().getSimpleName() + " onInterceptTouchEvent:" );
        return super.onInterceptTouchEvent(ev);
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        System.out.println(getClass().getSimpleName() + " onTouchEvent:");
        return super.onTouchEvent(event);
    }
}

布局:

<com.toly1994.d.event.ViewGroup1
    android:id="@+id/vg1"
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center"
    android:orientation="vertical">

    <com.toly1994.d.event.ViewGroup2
        android:id="@+id/vg2"
        android:layout_width="@dimen/dp_200"
        android:layout_height="@dimen/dp_200"
        android:background="@android:color/darker_gray"
        android:orientation="vertical"
        android:padding="20dp">

        <com.toly1994.d.event.View1
            android:id="@+id/v1"
            android:layout_width="100dp"
            android:layout_height="100dp"
            android:background="@android:color/white"
            android:gravity="center"
            android:padding="20dp"
            android:text="me is textview"/>
    </com.toly1994.d.event.ViewGroup2>

</com.toly1994.d.event.ViewGroup1>
2.生命函数测试

View2

public class View2 extends View {
    public View2(Context context) {
        super(context);
    }

    public View2(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
    }

    public View2(Context context, AttributeSet attrs) {
        super(context, attrs);
    }


    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        System.out.println(getClass().getSimpleName() + " onMeasure:" );
    }

    @Override
    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
        super.onSizeChanged(w, h, oldw, oldh);
        System.out.println(getClass().getSimpleName() + " onSizeChanged:" );
    }

    @Override
    protected void onLayout(boolean changed, int l, int t, int r, int b) {
        super.onLayout(changed, l, t, r, b);
        System.out.println(getClass().getSimpleName() + " onLayout:" );
    }

    @Override
    protected void onFinishInflate() {
        super.onFinishInflate();
        System.out.println(getClass().getSimpleName() + " onFinishInflate:" );
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        System.out.println(getClass().getSimpleName() + " onDraw:" );
    }
}

View3

public class View3 extends View {
    public View3(Context context) {
        super(context);
    }

    public View3(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
    }

    public View3(Context context, AttributeSet attrs) {
        super(context, attrs);
    }


    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        System.out.println(getClass().getSimpleName() + " onMeasure:" );
    }

    @Override
    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
        super.onSizeChanged(w, h, oldw, oldh);
        System.out.println(getClass().getSimpleName() + " onSizeChanged:" );
    }

    @Override
    protected void onLayout(boolean changed, int l, int t, int r, int b) {
        super.onLayout(changed, l, t, r, b);
        System.out.println(getClass().getSimpleName() + " onLayout:" );
    }

    @Override
    protected void onFinishInflate() {
        super.onFinishInflate();
        System.out.println(getClass().getSimpleName() + " onFinishInflate:" );
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        System.out.println(getClass().getSimpleName() + " onDraw:" );
    }
}

ViewGroup3

public class ViewGroup3 extends LinearLayout {
    public ViewGroup3(Context context) {
        super(context);
    }

    public ViewGroup3(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
    }

    public ViewGroup3(Context context, AttributeSet attrs) {
        super(context, attrs);
    }


    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        System.out.println(getClass().getSimpleName() + " onMeasure:");
    }

    @Override
    protected void onFinishInflate() {
        super.onFinishInflate();
        System.out.println(getClass().getSimpleName() + " onFinishInflate:");
    }

    @Override
    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
        super.onSizeChanged(w, h, oldw, oldh);
        System.out.println(getClass().getSimpleName() + " onSizeChanged:");
    }

    @Override
    protected void onLayout(boolean changed, int l, int t, int r, int b) {
        super.onLayout(changed, l, t, r, b);
        System.out.println(getClass().getSimpleName() + " onLayout:");
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        System.out.println(getClass().getSimpleName() + " onDraw:");
    }
}

布局:

<?xml version="1.0" encoding="utf-8"?>
<com.toly1994.d.event.ViewGroup3
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_margin="5dp"
    android:background="@color/bisque"
    android:orientation="horizontal">

    <com.toly1994.d.event.View2
        android:layout_width="100dp"
        android:layout_height="100dp"
        android:background="@color/blue_dark"/>


    <com.toly1994.d.event.View3
        android:layout_width="100dp"
        android:layout_height="100dp"
        android:background="@color/darkkhaki"/>

</com.toly1994.d.event.ViewGroup3>


后记、

1.声明:

[1]本文由张风捷特烈原创,转载请注明
[2]欢迎广大编程爱好者共同交流
[3]个人能力有限,如有不正之处欢迎大家批评指证,必定虚心改正
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posted on 2018-09-08 06:33  张风捷特烈  阅读(140)  评论(0编辑  收藏  举报